时间:2019-01-14 作者:英语课 分类:VOA标准英语2016年(六月)


英语课

全息图或可与CT及超生扫描仪兼容


Since the 1980s, doctors have used Magnetic Resonance 1 Imaging machines, or MRI scanners, to look into patients’ bodies without exposing them to the harmful effects of X-rays.An alternating magnetic field created inside the MRI's tube excites hydrogen atoms in the body’s tissues, making them emit radio waves. Those waves can be turned into pictures, similar to X-ray images. The magnet of a new MRI, built by Siemens, has 7 tesla units, making it more than 100,000 (7/0.000065 = 107,692) times more powerful than the earth’s magnetic field. “Using something like 7-tesla imaging, you can do very high resolution imaging, you can get the contrast that you need in order to identify the particular sub-parts of the nuclei 2 that you need, but even high-resolution two-dimensional black-and-white pictures are quite different from three-dimensional color renditions that can be viewed from all angles.Using MRI-generated images of water molecules 3 moving within the brain’s white matter, scientists at the British company Holoxica created a hologram showing the connections between neurons. “The brain is such a complex three-dimensional structure, and sometimes it is quite difficult to describe, or understand, the actual connections.So to see it in 3-D, that may be a short cut to education, and it can reinforce the learning process.”The holographic display is still in prototype phase, but researchers say, once ready for production, it will be compatible not only with MRI machines but also with CT and ultrasound scanners.


自上世纪80年代以来,医生一直使用磁共振成像机器,也就是磁共振扫描仪,来观察患者身体,使患者不必因暴露于X光下而受到伤害。在磁共振扫描仪管道内部产生的交互式磁场会激发人体组织内的氢原子,使氢原子发射出无线电波。这些无线电波的图像近似于X光线的图像。西门子研发的磁共振扫描仪有7特斯拉单元的磁通量,使扫描仪磁场为地球磁场的10万多倍。 “有了7特斯拉的成像技术,就可以做高清成像,就可以得到清晰的对比,从而确定原子核的不同部分。不过,即便是高清的二维黑白图像,也和三维的彩色图像不同,因为后者可以从不同角度观察。


通过使用磁共振扫描仪展示的关于水分子在大脑白质中移动的图像,英国公司Holoxica的科学家发明了一个全息图,可以展示神经元之间的关系。“大脑是极其复杂的三维结构,有时很难描述或理解其中的关系。所以,以三维的方式来观察大脑,对教育来说可能是一个捷径,可以加强学生的学习过程。”虽然全息显示尚处于初期阶段,但专家称,一旦投入生产,不仅与磁共振扫描仪兼容,也能与电脑断层扫描机(CT)和超声扫描仪兼容。



n.洪亮;共鸣;共振
  • Playing the piano sets up resonance in those glass ornaments.一弹钢琴那些玻璃饰物就会产生共振。
  • The areas under the two resonance envelopes are unequal.两个共振峰下面的面积是不相等的。
n.核
  • To free electrons, something has to make them whirl fast enough to break away from their nuclei. 为了释放电子,必须使电子高速旋转而足以摆脱原子核的束缚。
  • Energy is released by the fission of atomic nuclei. 能量是由原子核分裂释放出来的。
分子( molecule的名词复数 )
  • The structure of molecules can be seen under an electron microscope. 分子的结构可在电子显微镜下观察到。
  • Inside the reactor the large molecules are cracked into smaller molecules. 在反应堆里,大分子裂变为小分子。
学英语单词
alfrink
amplitude modulation ratio
astronaut extravehicular activity (eva)
autoattendant
basic equalization
body safety chain eye
bracings
break spectrum
C-scan
capture-recaptures
carburation by evaporation
carcinoma of Cowper's glands
cecycling economy
clarifying capacity
come into one's mind
come out top
complex voltage
cortisone in treatment of radiation illness
damage and shortage report
detachment(belling 1924)
difference of squares
edge-emitting light emitting diode
ekaterinite
encline
extemporaries
factor analysis
fantasising
fixed-tank vehicle
flavo(u)r reversion
forthlooks
Franquista
gas dehumidification
gas-heater
gene transcription
geocentric latitude
Gobēlē Wenz
greenbrier
gulfstreams
gyro vertical
homovital
human-control characteristics
in vivo studies
incapacitates
interrupt signal feedback
iron magnesium sulfate
isotope dilutions
jujube bush
kafenions
Kolašin
Latho
lion-heartedly
M. L.
Mache-Einheit
maurit
maxima/minima
melancholicks
meldola blue
membrance oyxgenators
microcar
minimization of bandwidth
minimum flow bypass valve
mir
Mulovskogo, Mys
nonconductive winding
nooruddin
Not so good!
oblique rhumb line
on-line typewriter
optimal adjustment model
pick axe
platanthera bifolias
power-frequency induction furnace transformer
prions
propelling machine
radio noise suppressor
reigen (germany)
reservation of power
rhytidium rugosum
roent
scooterboys
sense of proportion
series junction
sliding bowsprit
squatina japonica
stage matching
strip mining
structure of dots
sublimification
summonest
switched input value
Texas hold 'em
that's quite all right
the ordinary
totalmente
trickies
turkey-trot
underflow
unsalvaged
unsym-dimethylthiourea
virchows
voluntary agency
wagoned